20 乘法 40 等于多少？

20 × 39 = 780 20 × 41 = 820 20 × 38 = 760 20 × 42 = 840 20 × 37 = 740 20 × 43 = 860 20 × 44 = 880 20 × 36 = 720 19 × 40 = 760 21 × 40 = 840 22 × 40 = 880 18 × 40 = 720 23 × 40 = 920 17 × 40 = 680 24 × 40 = 960 16 × 40 = 640 8 × 100 = 800 10 × 80 = 800 16 × 50 = 800 25 × 32 = 800 32 × 25 = 800 40 × 20 = 800 8 × 15 = 120 81 × 57 = 4617 100 × 63 = 6300 37 × 97 = 3589 80 × 79 = 6320 47 × 76 = 3572 32 × 18 = 576 54 × 44 = 2376